CPRU

Compact

Pressure

Reduction Unit

SPECIFICATION

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COMPACT PRESSURE REDUCTION UNIT

Bison Compression is a New Zealand based manufacturer with 40 years’ experience in

CNG technology design and manufacturing.

The Bison Compact Pressure Reduction Unit CPRU is designed to make trailered CNG

available to a wider array of customers

Bison Designed for CNG Virtual Pipeline.

Designed to connect small Industrial, commercial and retail

customers to Natural gas by trailered CNG

Energy Efficient

No storage no pumps, no losses, fast acting heat

exchanger

Compact

Foot print of 800mm by 800mm which can include,

decanting, PRS and electrics

Manifold specifications CPRU-010

Two Stages of Heating

Two different pressure stages

o 1st stage 250-60bar Spring loaded regulator

o 2nd stage 60-1.5bar minimum Dome loaded regulator

Instrumentation ports

High density high efficiency insulation

Two Outlet ports

Electrical

4 Heating elements (1000 or 1500watt)

PT 100 temperature sensor port

CPRU-010 Module

Maximum Inlet Pressure: 345 bar

Minimum Inlet Pressure (Flow Dependent): 7 bar

Outlet Pressure Ranges (bar) 1 to 9 6 to 13 10 to 30 20 to 35 30-100

Outlet Temperature: Customer spec ±10 C

Max Flow Rate* per manifold: 100 or 150 nm3/h

Inlet Connection: 3/4” NPT

Outlet Connection: 3/4” NPT x2

Configuration

The CPRU systems are modular and can be configured to suit the client requirements.

Capacity

By installing multiples of CPRU modules with various element options offer a

comprehensive range of capacities

CAPACITY M3HR # MANIFOLDS ELEMENT SIZE # ELEMENTS

CPRU-050 50 1 1000 2

CPRU-100 100 1 1000 4

CPRU-150 150 1 1500 4

CPRU-200 200 2 1000 8

CPRU-300 300 2 1500 8

CPRU-450 450 3 1500 12

Trailer decant

Due to its small footprint the CPRU offers the ability to install the unit with the trailer

decanting system. Bison has designed the CPRU to have the ability to house all the

required decanting components

Single or dual trailer hose connections

Pre-charge system

Automatic changeover capable

Instrumentation

Flow meter with or without flowmeter

Actuation Pressure either on-board gas control or shop air connection

Electrics

On Skid

Remote control panel

Configuration examples

CPRU-015

150m3hr

One or Two trailer decanting connections

Hose isolation and bleed valves

Flow Meter

Remote electrical control panel

3 metre ground mount frame

CPRU-010

100m3hr

One or Two trailer decanting connections

Hose isolation and bleed valves

Remote electrical control panel

3 metre ground mount frame

CPRU-045

450m3hr

Two trailer decanting connections

Trailer Actuated isolation and pre-charge Valves

Manual Hose bleed valves

Automatic trailer change over capable

Self-Monitoring and fault

On Skid electrical control panel

3 metre ground mount frame

Operation

The CPRU system is modular and has different operating

characteristics depending on the client requirements

Decanting

Manual Manual valve isolates the trailer hose and bleed

valves vents the gas from the hose

Automatic Automated valves change between empty and full

trailers. Unit has manual vent valves.

Pre-charge When trailers change the pre-charge valve opens to

eliminate any high velocity pressure changes

Heating

The PRU has two parallel heating control systems to ensure safe

efficient heating

Manifold The manifold temperature is limited to a maximum

set point, this is controlled by a temperature sensor

in each manifold to avoid thermal runaway

Gas temperature, the gas temperature is controlled by a sensor on

the outlet line of the system. This manages the

amount of heat required for the system

Pressure controls

The CPRU has various methods to control pressure

Stage one a spring loaded regulator

Stage two Dome loaded regulator controlled by pilot gas

System

The outlet pressure is monitored and if the pressure exceeds the

set pressure by 0.5 bar the system will shut down. Depending on

the model the unit can determine if the pressure rise is due to a no

flow situation or the unit requires a service and can send a service

instruction via the PLC.

Configuration example CPRU-045 with dual automatic trailer changeover valves, pre-charge system

and three CPRU-010 manifolds

Pre-charge Line

Solenoid/Actuator line

Dome Pilot Regulators

Pressure from Dome Pilot

Regulators control pressure

from 2nd stage of CPRU

Module

Outlet Pipe

CPRU drops pressure from

Inlet, through 1st stage to

Outlet pressure

Inlet from trailer Inlet from trailer

Eclipse Valves

Eclipse Valves is a sister company of Bison compression and work hand in hand in

developing valve technology to enhance the performance and reliability of Bison systems

Ball Valves High performance durable ball valves exceptional long operational life

Operating Temperature -40 to +85C Max Operating Pressure 6000psig VBN-xxx

Check Valves used to eliminate back pressure on decanting lines

Operating Temperature -65 to +85C Max Operating Pressure 5000psig VNN-xxx

Pilot regulators Controls the dome pressure and process Gas

Operating Temperature -40to +85C Max Operating Pressure 5000psig VRHN-0404-xx

Outlet minimum pressure 1psig Outlet maximum 3600psig

Solenoid Valves 3 way solenoid valve for actuator controls

Safety Valves Taylor self-seating high pressure relief valves

Filters can be installed on the inlet line of the PRS

Safety

Electrical

The CPRU system controls are configured to different options

depending on the customer requirements and budget.

Enclosures

On-board explosion proof

Remote out of Zone enclosure

Controls

Basic On off and heating controls

Semi-Automated controls

Fully automated PLC control system

Decanting

No decanting controls

On off controls

Fully Automated controls with pre-charge

Electrical components

Pressure transmitters EXia with isolation protection barriers

Temperature RTD EXD enclosed

Solenoids EX rated solenoid coils

Elements Comes complete with EXD connection

housing

Mounting Details

Mounting footprint for CPRU systems is the same for all frame

mounted systems. The enclosure size will vary from CPRU model to

model

Bison Technology

CNG Compressors

300HP Horizontally opposed

Daughter station VIP

PRS systems

15 to 3000m3hr

Decanting systems

Filtration systems

High Flow high pressure

Oil Carryover removal

Oil recovery and recycling

CNG Station Technology

Priority systems

Valving and fittings systems

MaxFILL Trailer fill systems

TiMS Daughter station equipment

Bison Compression

113 North Road

Clevedon Auckland New Zealand

Phone +6492929115

Email info@bisoncompression.com

www.bisoncompression.com

mailto:info@bisoncompression.com